Hello, I am currently in Europe and have an adapter that allows me to plug in my Macbook Pro. The adapter allows a 3 prong input and has a 2 prong output. This is the only type of adapter I could find. When I run my MacBook Pro plugged in, I get a weird vibration or mild shocking feeling when I rub my hand against it. I understand this may be from grounding. My big question is, is this safe for my MacBook Pro? Thanks.